fuse box DATSUN 510 1968 Service Repair Manual

CHAPTER
THREE

TROUBLESHOOTING

TroubleshootIng
the
Datsun
can
be

relatlvely

simple
1f
done

lOgically
The
first

step
must

always
be
to
define

symptoms
as

closely
as

pos

Sible

Subsequent
steps
mvolve

testIng
and
an

alyzmg
areas
which
could
cause
the

symptoms

Procedures
m
thiS

chapter
analyze
typical
symp

toms
and

give
lOgical
methods
of
isolation

These
are
not
the

only
methods
There

may
be

several

approaches
to

solvmg
a

problem
but
all

must
have
one

thmg
m
common
a

lOgical

systematic
approach

TROUBLESHOOTING
EQUIPMENT

The

followmg
eqUipment
is

necessary
to

prop

erly
troubleshoot
an

engme

1
Voltmeter
Ammeter
and
Ohmmeter

2

Hydrometer

3

Compression
Tester

4
Vacuum

Gauge

5
Fuel
Pressure

Gauge

6

Dwell
Meter

7
Tachometer

8

StroboscopiC
Trming
Light

9
Exhaust
Gas

Analyzer

Items
1

through
8
are
essentlal
Item
9

is

necessary
for
exhaust
elDlSSion
control

comph

ance
The

followmg
is
a
bnef

description
of
the

functlon
of
each
mstrument
Voltmeter
Ammeter
and
Ohmmeter

For

testIng
the

ignitlon
and
electncal

systems

a

good
voltmeter
is

reqUIred
For
automotIve

use
an
mstrument

covenng
0
20
volts
is
salls

factory
It
should
have
an

accuracy
of
about

Ih

volt
which
excludes
the
common
auto

moUve

type
found
in
instrument

panels

An
ohmmeter
measures
electncal
reSiStance

and

is

reqUired
to
check
electncal

contInUity

open
and

short
circwts
and
for

testing
fuses

and

hghts

The
ammeter
measures
electncal
current
One

for
automotIve
use
should
cover
0
10
and
0
100

amperes
An
ammeter
is
useful
for

checkmg
bat

tery
chargmg
and

startIng
current
The
starter

and

generator
procedures
m
tlus
manual

use
an

ammeter
to
check
for
shorted

wmdmgs
Several

inexpensive
VOM
s
volt
ohmmeters
combme

all
mstruments
and
fit

easily
mto

any
tool
box

The
ammeter

ranges
are
often
too
small
for

auto

motIve
work

thougll

Hydrometer

A

hydrometer
is

necessary
to
check

battery

condition
and

charge
It
measures

specific
grav

ity
of
the

electrolyte
in
each
cell

Compression
Tester

The

compressiOn
tester
measures

compression

BODY

ELECTRICAL

SYSTEM

217

bulb

socket
must

be

pulled
out
from
the
back

of

the
unit

and
then
the
bulb
can
be

replaced
Care

fully

mspect
the
unit
that

reqUIres
bulb

replace
ment
and
follow
the

appropriate

procedure

Make

certain

you

replace
the
bulb

with
one

rated
at
the
same

voltage
amperage
and
watt

age
Examples
of

units
that

might

require
bulb

replacement
are
the
front

park
and

directional

lamps
rear

combination

lamp
side

marker

lamps
interior
room

lamps
license

plate
lamps

and

engine

compartment
lamps

Fuse

Replacement

Whenever

a
fallure
occurs

m

any

part
of

the

electrical

system
always
check
the

fuse
box
to

see
1f

a
fuse
has
blown
The
fuse

box
is
located

on
the

firewall
within
the

engine

compartment

If
a
fuse
has
blown
It
will
be
eVident

by
bIacken

mg
of
the
fuse
or

by
a
break
of
the

metal
element

Within
the
fuse

The

wiring
diagrams
below

mdIcate

the
cir

cuits

that
are
connected

to
each
fuse

Before

replacing
a
fuse

always
detenIlIDe
what
caused

it
to
blow
and
correct
the

trouble

Never

replace

a
fuse
With
one
of

a

higher

amperage
ratIng
than

originally
used
Never

use
tmfOll
or
other
ma

tenal
to

Jump
across
fuse

tenIlIDals

Failure
to

follow
these

basic
rules

could
result
in

fire
or

damage
to

major
components

WIRING

DIAGRAMS

The

following
figures

provide
wiring
diagrams

for
the
sedan

wagon
and

pick
up
Figure
20

page
220

applies
to
the
sedan
and
station

wagon
with

manual
transmission

Figure
21

page
221
covers
the
sedan
and

station

wagon

With
automatic
transmission

Figure
22

page

222
is
for
the

pick
up
I